Add pagination support to list groups endpoint, and fix broken tests
Add test to make sure the next link is formatted correctly
Fix bug where it was checking limit.paginate in the config, rather than limits.paginate
Shorten docstring
Merge pull request #395 from rackerlabs/paginate-list-groups-endpoint-part-2

Paginate list groups endpoint part 2
Merge branch 'master' into auto-185-bobby-is-a-hard-worker